@flyer i'm using the same version with Avast Free without any problems.Most likely it's a false positive.You need to report it in their forum and also look for a option to whitelist it.Don't worry,there is no virus in it 🙂

P.S. I just did more research and found THIS which confirms that it's false positive so you good(the reply is from the creator of CUDA-Z and can be trust it)